Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Home to drunken tower-climbing goats... seriously.

Mile-long cave system near Great Smoky Mountains.

The secret city built by the Manhattan Project.

This replica of the Greek structure is in the heart of Nashville.

More than five miles of underground passageways.

Railroad came. People came. Railroad left. Town died.

Visit this playground of waterfalls, caves and sinkholes.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Enormous lake at the bottom of a unique cave system.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

World's largest precision optical instrument used to detect Einstein's elusive gravity waves.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

Pirates had to be ousted from the land where this now ruined Louisiana fortress was built.

This Birdsill Holly fire hydrant is the remnant of a very different type of hydration innovation.

A 19th-century Gothic, castle-like statehouse by the Mississippi River.

A swamp and garden tour featuring local wildlife and exotic botanical specimens from around the world.

A Cajun-style Christmas on the river also involves sky-high pyres and explosives.

The crumbling ruins of this southern American fort have survived storms, war, and cults.

A museum dedicated to the lovable crime couple Bonnie & Clyde, just a few miles away from the site of their early demise.

For 150 years one family has been producing the iconic hot sauce on a bayou island made of salt.